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boiler service, boiler repair, emergency repair
Vaillant ecoFitpure 430 Boiler Fault Codes
| Code | Meaning | Cause |
| F00 | Flow temperature sensor interruption | NTC plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, NTC defective |
| F01 | Return temperature sensor interruption | NTC plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, NTC defective |
| F10 | Flow NTC short circuit | NTC defective, short circuit in cable harness, cable/casing |
| F11 | Return NTC short circuit | NTC defective, short circuit in cable harness, cable/casing |
| F13 | Warm start sensor/cylinder sensor short circuit | NTC defective, short circuit in cable harness, cable/casing |
| F22 | Safety switch-off: Low water pressure | No or insufficient water in the product, water pressure sensor defective, cable to pump or water pressure sensor loose/not connected/defective |
| F23 | Safety switch-off: Temperature difference too great | Pump blocked, insufficient pump output, air in product, flow and return NTC connected the wrong way round |
| F24 | Safety switch-off: Temperature rise too fast | Pump blocked, insufficient pump output, air in product, system pressure too low, non-return valve blocked/incorrectly installed |
| F25 | Safety switch-off: Flue gas temperature too high | Break in plug connection for optional flue gas safety temperature limiter (STB), break in cable harness |
| F27 | Safety switch-off: Flame simulation | Moisture on the electronics, electronics (flame monitor) defective, gas solenoid valve leaking |
| F28 | Failure during start-up: Ignition unsuccessful | Gas meter defective or gas pressure monitor has triggered, air in gas, gas flow pressure too low, thermal isolator device (TAE) has triggered, condensate duct blocked, incorrect gas restrictor, incorrect spare part gas valve, fault on the gas valve, multiple plug on PCB incorrectly plugged in, break in cable harness, ignition system (ignition transformer, ignition cable, ignition plug, ignition electrode) defective, ionisation current interrupted (cable, electrode), incorrect earthing of product, electronics defective |
| F29 | Failure during operation: Re-ignition unsuccessful | Gas supply temporarily stopped, flue gas recirculation, condensate duct blocked, defective earthing of product, ignition transformer has spark failure |
| F32 | Fan fault | Plug on fan not correctly plugged in, multiple plug on PCB not correctly plugged in, break in cable harness, fan blocked, Hall sensor defective, electronics defective |
| F49 | Fault: eBUS | Short circuit on eBUS, eBUS overload or two power supplies with different polarities on the eBUS |
| F61 | Fault: Gas valve regulation |
- Short circuit/short to earth in cable harness for the gas valve – Gas valve defective (coils shorted to earth) – Electronics defective |
| F62 | Fault: Gas valve switch-off delay |
– Delayed shutdown of gas valve – Delayed extinguishing of flame signal – Gas valve leaking – Electronics defective |
| F63 | Fault: EEPROM | Electronics defective |
| F64 | Fault: Electronics/NTC | Flow or return NTC short circuited, electronics defective |
| F65 | Fault: Electronics temp. | Electronics overheating due to external influences, electronics defective |
| F67 | Fault: Electronics/flame | Implausible flame signal, electronics defective |
| F68 | Fault: Unstable flame signal | Air in gas, gas flow pressure too low, incorrect air ratio, condensate duct blocked, incorrect gas restrictor, ionisation flow interruption (cable, electrode), flue gas recirculation, condensate duct |
| F70 | Invalid device specific number (DSN) | If spare parts fitted: Display and PCB replaced at same time and DSN not reset, incorrect or missing output range coding resistance |
| F71 | Flow NTC fault |
Flow temperature sensor signalling constant value: – Flow temperature sensor incorrectly positioned at supply pipe – Flow temperature sensor defective |
| F72 | Flow/return NTC fault | Flow/return NTC temperature difference too great → flow and/or return temperature sensor defective |
| F73 | Water pressure sensor signal in the wrong range (too low) | Interruption/short circuit of water pressure sensor, interruption/short circuit to GND in supply line to water pressure sensor or water pressure sensor defective |
| F74 | Water pressure sensor signal outside correct range (too high) | Line to water pressure sensor has a short circuit to 5 V/24 V or internal fault in the water pressure sensor |
| F75 | Fault: No pressure change detection when starting pump | Water pressure sensor and/or pump defective, air in the heating installation, insufficient water in the product; check adjustable bypass, connect external expansion vessel to the return |
| F76 | Overheating protection on primary heat exchanger has responded | Cable or cable connections for safety fuse in primary heat exchanger or primary heat exchanger defective |
| F77 | Fault: Flue non-return flap/condensate pump | No response from flue non-return flap or condensate pump defective |
| F83 | Fault: Flow and/or return temperature sensor temperature change |
When the burner starts, the temperature change registered at the flow and/or return temperature sensor is non-existent or too small. – Insufficient water in product – Flow or return temperature sensor not in correct position at pipe |
| F85 | Fault: Flow and return temperature sensors incorrectly installed | The flow and/or return temperature sensors have been installed on the same pipe/incorrect pipe |
| F87 | Ignition transformer not connected | Ignition transformer plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, electronics defective |
| F88 | Gas valve not connected | Gas valve plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, electronics defective |
| F89 | Incorrect pump detected | Unsuitable pump connected, PWM plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interruption in cable harness, electronics defective |
| con | No communication with the PCB | Communication fault between display and PCB in the electronics box |